Improving Influenza Immunization in Pregnant Women and Healthcare Workers

Influenza vaccination rates in pregnant women and healthcare workers were increased with standing orders, vaccine advocates, and educational activities on influenza immunization.

Published Online: March 09, 2010
Melanie E. Mouzoon, MD; Flor M. Munoz, MD; Anthony J. Greisinger, PhD; Brenda J. Brehm, MA; Oscar A. Wehmanen, MS; Frances A. Smith, MD; Julie A. Markee, RN, MPH; and W. Paul Glezen, MD

Objective: To evaluate the effect of several strategies to increase influenza immunization in a multispecialty clinic.


Study Design: Retrospective electronic database analysis of influenza vaccinations in a 6-year period at Kelsey-Seybold Clinic in Houston, Texas.


Methods: We evaluated immunization rates in pregnant women and healthcare workers during 6 influenza seasons (2003-2004 to 2008-2009) after implementing the following strategies for pregnant women: assessing baseline immunization rates for obstetric providers, followed by direct encouragement and behavior modeling; implementing standing orders for influenza vaccination in pregnancy; and offering vaccination training to obstetricians and nurses. Further strategies implemented for healthcare workers included the following: conducting an employee survey about influenza knowledge, providing employee education based on survey findings and Centers for Disease Control and Prevention recommendations, making employee vaccines readily available and free of charge, designating immunization nurses to serve as clinical champions, monitoring and reporting the employee influenza vaccination rate, and recognizing the clinic with the highest employee vaccination rate.


Results: Influenza vaccination coverage rates in pregnant women increased from 2.5% at baseline to 37.4% in 2008-2009. Employee influenza vaccination coverage rates increased from 36.0% in 2003-2004 to 64.0% in 2008-2009.


Conclusion: Low influenza vaccination rates in pregnant women and healthcare workers can be substantially improved using methods shown to be effective in other clinical settings.


(Am J Manag Care. 2010;16(3):209-216)

Influenza vaccination rates in pregnant women and healthcare workers increased after the following:

  • Assessing baseline immunization rates for obstetric providers, followed by direct encouragement and behavior modeling, standing orders for influenza vaccination in pregnancy, and vaccination training to obstetricians and nurses.
  • Conducting an employee survey about influenza knowledge and providing employee education based on survey findings and Centers for Disease Control and Prevention recommendations.
  • Making employee vaccines readily available and free of charge.
  • Designating immunization nurses to serve as clinical champions and monitoring and reporting the employee influenza vaccination rate.
The Advisory Committee on Immunization Practices (ACIP) and the Centers for Disease Control and Prevention (CDC) recommend that pregnant women receive influenza vaccination.1 However, coverage in the United States in 2005-2006 was only 12.8% in this vulnerable population.1 Influenza immunization is not routine in most obstetric practices, and immunization of pregnant women is routinely avoided by most nonobstetric immunization providers because of a lack of familiarity or comfort with vaccinations in pregnancy.2-5 Immunization for influenza has also not been well accepted by obstetricians and pregnant women, despite ACIP recommendations, because of concerns about the lack of safety data on vaccination of pregnant women and the recommendation before 2004 to  defer immunization until the second or third trimester.2,6-9

Healthcare workers are at high risk for acquiring and spreading influenza infection because of their exposure to ill patients and their exposure in the community. Research suggests that healthcare workers can be a key source of institutional outbreaks, which can contribute to increased morbidity and mortality among vulnerable patients.10 Despite longstanding recommendations from the ACIP, CDC, and the Association for Professionals in Infection Control and Epidemiology,10 less than 50% of healthcare workers who have direct contact with patients are immunized annually.11-13

Strategies are needed to increase immunization rates in pregnancy and among healthcare workers. This article describes strategies to increase influenza vaccination coverage among pregnant women and healthcare workers in a large multispecialty clinic setting in Houston, Texas.


Study Setting

Founded in 1949, Kelsey-Seybold Clinic (KSC) is a large multispecialty medical organization with more than 300 physicians and approximately 2100 employees that provides care to a racially/ethnically diverse population of more than 350,000 patients at 19 clinics in Houston, Texas. The racial/ethnic diversity of KSC patients who have been recruited for research studies is 64.7% non-Hispanic white, 22.5% non-Hispanic African American, 11.2% Hispanic, and 1.4% Asian. Regarding insurance, 24.3% of KSC patients are enrolled in capitated healthcare plans, 65.3% in preferred provider plans, 5.1% in Medicare or Medicaid, and 4.8% in fee-for-service plans. Kelsey-Seybold Clinic offers physician services in 34 medical specialties and subspecialties and provides more than 1.2 million patient visits annually. The KSC obstetrics and gynecology department has 29 obstetricians, who deliver approximately 2500 infants annually at 5 Houston-area hospitals.

Kelsey-Seybold Clinic has developed a robust infrastructure for immunizations throughout the multispecialty clinic, with vaccines offered at most clinic locations, training programs for nurses on immunization issues, and annual promotion of influenza immunizations to employees and patients. Since 1993, a managing physician for immunization practices (MEM) has had primary responsibility for increasing immunization rates and formalizing policies in pediatrics and in 1998 assumed the responsibility for implementing immunization standing orders clinicwide, with the additional assignment to address immunization issues in adult medicine areas in 2001.

Founded in 1956, the Kelsey Research Foundation (KRF) develops and evaluates patient care and education programs and conducts health services research. The KRF maintains a database with obstetric information on more than 18,000 women and infants, enabling us to examine maternal and infant outcomes. The KSC obstetrical research committee, a joint collaboration between the KRF and The Woman’s Hospital of Texas (Houston), conducts research to improve the quality of care for women and infants.

Study Design

This study was a retrospective electronic database search of influenza vaccinations for pregnant women and healthcare workers during 6 consecutive influenza seasons (2003-2004 to 2008-2009) at KSC. A baseline immunization rate among pregnant women of 2.5% was determined through a review of billing data from 1998 to 2002. Pregnancy is a 9-month occurrence, and influenza immunization activities in general last approximately 6 months, with the possibility of some pregnancies being immunized in the spring and the fall and other pregnancies missing immunization activities altogether as a result of late prenatal care and  delivery before vaccine arrival in the fall. In addition, vaccination activities in the past 2 seasons have been encouraged to begin as soon as vaccine is available and to continue into the spring, whereas in prior years they were concentrated in the fall and early winter months. Therefore, vaccination years were standardized for this study to coincide with an influenza vaccine expiration date of June 30. The database was searched for influenza vaccinations billed through the obstetrics and gynecology department and other departments at KSC for women who delivered a live-born infant between July 1 of one year and June 30 of the subsequent year. The database search did not capture immunizations provided outside of the KSC. In 2006, KSC developed a billing code to capture the history of outside immunizations; however, this code is not used with regularity by all providers.

The KSC administrative database was searched for vaccinations for healthcare workers from 2003-2004 to identify vaccination opportunities among them. The immunization rate for healthcare workers was 36.0% at baseline, equivalent to the national mean at the time.14 Inactivated influenza vaccine was offered to patients and healthcare workers from October through February in 2006-2007. It was offered as soon as it was available through April in 2007-2008 and 2008-2009.

Study Population

The study population included all pregnant women under the care of a KSC physician during 6 influenza seasons from 2003-2004 to 2008-2009 (July 1 through June 30), a mean of 2081 per year. Data were also collected on KSC healthcare workers (approximately 2000 healthcare workers in each year of the study) through an employee influenza campaign.


Influenza Vaccination Program for Pregnant Women. Beginning with the 2004-2005 influenza season, KSC implemented 3 strategies (listed herein) to increase influenza immunization rates among pregnant women. Research has demonstrated that these strategies are effective in increasing immunization rates among pediatric populations, and their implementation among adult populations has been encouraged by the National Vaccine Advisory Committee.15

First, baseline immunization rates for each obstetrician’s pregnant population were assessed using the billing database. Information on individual and departmental rates was provided to each obstetrician. This assessment was followed by direct encouragement to immunize according to ACIP guidelines in any trimester of pregnancy. The chief of the obstetrics and gynecology department (FAS) served as an immunization champion, modeling behaviors such as encouraging nurse assessment and promotion of immunization and immunizing patients at every opportunity. Educational updates on influenza vaccination in pregnancy and regular rate assessments were provided to obstetricians, nurses, and staff during quarterly meetings.

Second, standing orders for influenza vaccine administration were revised to specifically encourage immunization in pregnancy by all immunization providers (primary care physicians and immunization nurses). Training on their use was provided to obstetricians, obstetric nurses, and immunization nurses.

Third, obstetric nurses were offered training on vaccinations and were encouraged to take the initiative in identifying and completing immunization for eligible patients. Strong departmental leadership and physician interest in best practices led to the routine practice of nurses’ taking responsibility for immunization of pregnant patients under standing orders for most, but not all, providers.

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